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Functional Conservation of an AGAMOUS Orthologous Gene Controlling Reproductive Organ Development in the Gymnosperm Species Taxus chinensis var. mairei

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Abstract

Arabidopsis AGAMOUS (AG) has roles in specifying reproductive organ (stamens and carpels) identity, floral meristem determinacy, and repression of A-function. To investigate possible roles of AG orthologous genes in gymnosperm species and evolution of C function, we isolated and identified AG orthologous gene TcAG from Taxus chinensis var. mairei (family Taxaceae, order Coniferales), a member of the last divergant lineage from higher Conifer that sisters to Gnetales. Sequence alignment and phylogenetic analysis grouped TcAG into the gymnosperm AG lineage. TcAG was expressed in both developing male and female cones, but there was no expression in juvenile leaves. Ectopic expression of TcAG in an Arabidopsis ag mutant produced flowers with the third whorl petaloid stamen and fourth whorl normal carpel, but failed to convert first whorl sepals into carpeloid organs and second whorl petals into stamenoid organs. A 35S::TcAG transgenic Arabidopsis ag mutant had very early flowering, and produced a misshapen inflorescence with a shortened floral axis. Our results suggest that establishment of the complete C-function occurred gradually during AG lineage evolution even in gymnosperms.

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Authors and Affiliations

  1. College of Horticulture and Gardening, Yangtze University, Jingzhou City, Hubei, 434025, P.R. China

    Zhi-Xiong Liu, Hai-Yan Xiong, Lai-Yun Li & Yong-Jun Fei

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  1. Zhi-Xiong Liu
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  2. Hai-Yan Xiong
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  3. Lai-Yun Li
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  4. Yong-Jun Fei
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Correspondence to Zhi-Xiong Liu or Yong-Jun Fei.

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Liu, ZX., Xiong, HY., Li, LY. et al. Functional Conservation of an AGAMOUS Orthologous Gene Controlling Reproductive Organ Development in the Gymnosperm Species Taxus chinensis var. mairei. J. Plant Biol. 61, 50–59 (2018). https://doi.org/10.1007/s12374-017-0154-4

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